#define PERIPH_BASE ((unsigned int)0x40000000)
#define AHB1PERIPH_BASE (PERIPH_BASE + 0x00020000)
#define GPIOF_BASE (AHB1PERIPH_BASE + 0x1400)
#define GPIOF_MODER *(unsigned int*)(GPIOF_BASE+0x00)
#define GPIOF_BSRR *(unsigned int*)(GPIOF_BASE+0x18)
#define RCC_BASE (AHB1PERIPH_BASE + 0x3800)
#define RCC_AHB1ENR *(unsigned int*)(RCC_BASE+0x30)
